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You can synchronise a vast amount of content associated with iCloud, including your documents and data, which includes Pages, Keynote and other Apple software. You can also remotely manage your storage and backup solution here, too.
Photo Stream turned on allows you to upload your photos automatically to iCloud and download them to all of your devices. So, you can take a photo on your iPod touch or iPhone and it will near instantly appear on your Mac or other iOS devices, too.
iCloud also lets you upload your Pages, Keynote and Numbers documents and other data in the cloud, letting you take your documents with you wherever you go. Think of it a bit like SkyDrive, except Apple is now jumping on the cloud computing bandwagon.